Geotextile, also known as geotextile, is a permeable geosynthetic material made from synthetic fibers through needle punching or weaving. Geotextile is one of the new materials of geosynthetics, and the finished product is in the form of a cloth, with a width of 4-6 meters and a length of 50-100 meters. Geotextiles are pided into woven geotextiles and non-woven filament geotextiles. Geotextiles have excellent filtration, drainage, isolation, reinforcement, and protection functions, and have characteristics such as light weight, high tensile strength, good permeability, high temperature resistance, freezing resistance, aging resistance, and corrosion resistance. Permeability coefficient refers to the characteristic index of a geosynthetic material itself; For example, geotextile, geomembrane, soft water pipe, etc. According to the different directions of water flow, the permeability coefficient of geotextile is measured, pided into vertical permeability coefficient and horizontal permeability coefficient. That is to say, the permeability coefficient of geosynthetics is generalized and refers to a general term. The vertical permeability coefficient is unique to geotextiles. The testing methods for various permeability coefficients are similar to those for vertical permeability coefficients P>
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